Solve the problem.The function A = A0e-0.01155x models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 500 pounds of the material are placed in the vault, how much time will need to pass for only 140 pounds to remain?
A. 220 years
B. 120 years
C. 110 years
D. 115 years
Answer: C
Mathematics
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Mathematics
Evaluate the expression.(-4)-1
A. -4
B. - 
C. 
D. 4
Mathematics
Determine the vertex of the graph of the parabola.y = x2 - 2x + 4
A. 
B. (1, -1)
C. (1, 3)
D. (1, -3)
Mathematics
Factor completely. If the polynomial cannot be factored, write "prime."5x3 + 5x2y - 60xy2
A. 5x(x + 3y)(x - 4y) B. (x - 3y)(5x2 + 20xy) C. 5x(x - 3y)(x + 4y) D. (5x2 + 15xy)(x - 4y)
Mathematics